The HPS 1-1/2″ (38mm) ID, 1-3/4″ Long Black Silicone Reinforced Coolant Cap For Bypass Heater Vacuum Valve Water Port is one of our steady sellers in Hoses & Fittings, and it ships from the USA.

Hoses and fittings work under pressure and heat, where material choice decides service life. Measure inner diameter at the fitting rather than estimating by eye.
Every long black silicone reinforced order goes through the same fitment review.
Ordering the long black silicone reinforced takes a minute and the confirmation reaches you straight away.
Our team knows the long black silicone reinforced well, so ask if anything about the specification is unclear.
Stock of the long black silicone reinforced is live on this page rather than estimated.
Shops order the long black silicone reinforced from us in volume because the data on the page is accurate.
If your build is unusual, tell us and we will confirm the long black silicone reinforced against it.
The long black silicone reinforced ships protected, because a damaged part helps nobody.
Details that matter
- Material: Silicone
- Finish: Black
- Category: Universal Hose
- Price: $30.15 with free shipping over $99
- Availability: in stock, dispatched from the USA
Manufacturer specifications
The HPS Performance 1-1/2″ (38mm) high temperature reinforced black silicone cap is designed specifically to be installed on your cooling system. Vacuum caps have no reinforcement and are intended for vacuum and very little pressure. The HPS reinforced silicone caps are manufactured just like our reinforced silicone radiator hoses. While traditional rubber coolant cap might crack and cause coolant leak, HPS Performance high temperature 3-ply polyester reinforced silicone caps will withstand the high temperatures and pressures of your cooling system for years to come.
HPS Reinforced Silicone Caps are compatible for use with coolant, water, air, turbocharger bypass valve ports, vacuum ports, throttle body water ports, heater cores, and much more.
Technical Specification
Product Type: Reinforced Silicone Coolant Cap
HPS Part Number: RSCC-150-BLK
Temperature Range:- 65 deg. F to + 350 deg. F (177 deg. C)
Reinforced Layer: 3-ply Polyester
Inside Diameter: 1-1/2″ (38mm)
Color: Black
Wall Thickness: 4mm
Inside Length: 1-3/16″
Overall Length: 1-3/4″
UV and ozone resistant
Remark: HPS reinforced silicone caps are not compatible with fuel, oil, or any petroleum-based products.
- Material: 3-Ply Reinforced Polyester Silicone
- Color: Black
- Made of High Temperatureerature 3-ply Polyester Reinforced Silicone. Maximum Temperature Rating: 350 deg. F (177 deg. C).
- Ideal for heavy duty pressure connections and provides excellent resistance for high temperature applications
- Compatible for use with coolant, water, air, turbocharger bypass valve ports, vacuum ports, throttle body water ports, heater cores, and much more.
- Inside Diameter: 1-1/2″ (38mm). Overall Length: 1-3/4″
- HPS reinforced silicone caps are not compatible with fuel, oil, or any petroleum-based products.
Application:
HPS Reinforced Silicone Caps are Universal Fit that compatible for use with coolant, water, air, turbocharger bypass valve ports, vacuum ports, throttle body water ports, heater cores, and much more.
Remark:
Installation: Compatible with Water/Coolant ONLY, Not for Fuel/Oil
Product Content:
- 1 x Coolant Cap
The product does not come with manual/instruction, Professional Install Recommended
Cross Reference Number:
- RSCC-150-BLK, RSCC150BLK
Send the old part number or a photo and we will match it against this listing before you commit.
Related listings: Hoses & Fittings · HPS 2.38″, 2.75″ (60mm, 70mm) ID, 6″ Leg Long Black 4-Ply Silicone 1/2″ Offset Reducer Hose · HPS 2.25″, 2.5″ (57mm, 63mm) ID, 6″ Leg Long Black 4-Ply Silicone 1/2″ Offset Reducer Hose · full catalog
Finished surfaces are wrapped and hardware is bagged, so the part arrives ready to install.
For neutral background on this kind of maintenance, see the NHTSA vehicle safety hub.
Buyer questions
Will this part fit my vehicle?
The application text on this page lists what the part serves. If your vehicle is not clearly covered, send the VIN and we will rule on it before you pay.
When will my order dispatch?
Your tracking link arrives by email at label creation and stays live until delivery, so you can follow the parcel the whole way.
How do returns work here?
Parts are covered against defects for the period stated on this page, and non defect returns follow our standard returns window.
How do you protect it in transit?
Lines and fittings are checked for pressure rating, inner diameter and ply count before shipping.
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